CN107965853B - Outdoor unit of three-pipe multi-split air conditioner system and control method - Google Patents
Outdoor unit of three-pipe multi-split air conditioner system and control method Download PDFInfo
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- CN107965853B CN107965853B CN201711386739.0A CN201711386739A CN107965853B CN 107965853 B CN107965853 B CN 107965853B CN 201711386739 A CN201711386739 A CN 201711386739A CN 107965853 B CN107965853 B CN 107965853B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000003507 refrigerant Substances 0.000 claims abstract description 148
- 238000010438 heat treatment Methods 0.000 claims abstract description 118
- 239000007788 liquid Substances 0.000 claims abstract description 96
- 238000005057 refrigeration Methods 0.000 claims description 7
- 238000000429 assembly Methods 0.000 claims description 6
- 230000000712 assembly Effects 0.000 claims description 6
- 238000004378 air conditioning Methods 0.000 description 7
- 239000002699 waste material Substances 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013526 supercooled liquid Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/08—Compressors specially adapted for separate outdoor units
- F24F1/10—Arrangement or mounting thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/14—Heat exchangers specially adapted for separate outdoor units
- F24F1/16—Arrangement or mounting thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses an outdoor unit of a three-pipe multi-split air conditioner system and a control method, wherein the outdoor unit is provided with a high-pressure liquid pipe, a low-pressure air pipe and a high-pressure air pipe, and comprises: the device comprises a compressor, a first reversing assembly, a second reversing assembly, an outdoor heat exchanger, a heating device and a control device. The heating device heats the refrigerant flowing from the low-pressure air pipe to the air return port, and the control device is connected with the heating device to control the heating device to be opened or closed. According to the outdoor unit of the three-pipe multi-split air conditioner system, the heating device and the control device are arranged, and the control device can control the heating device to heat the low-pressure air pipe, so that the liquid refrigerant in the low-pressure air pipe is heated and gasified into the gaseous refrigerant, the phenomenon that the liquid refrigerant enters the compressor to generate 'liquid impact' is effectively prevented from damaging the compressor, the working performance of the compressor is improved, and the heat exchange performance of the outdoor unit is further improved.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to an outdoor unit of a three-pipe multi-split air conditioner system and a control method.
Background
In the related art, when the temperature of the outdoor air is low, the outdoor heat exchanger cannot form high condensation pressure, so that an effective pressure difference cannot be generated to press the refrigerant from the outdoor machine to the indoor machine side, so that less indoor side refrigerant is usually caused, the refrigerant becomes gas to exit the indoor machine in a superheated state after the indoor side absorbs heat, but because the temperature of the outdoor machine is too low, when a small amount of overheated gas encounters a low outdoor temperature, the overheated gas is liquefied into low-temperature supercooled liquid to return to a low-pressure tank of the outdoor compressor, and because the circulation volume of the system is too small, the state of the refrigerant returning to the outdoor machine is in a saturated state with liquid, the service life of the compressor is influenced, meanwhile, the compressor cannot be effectively increased in frequency because of wet compression protection, the circulation volume of the refrigerant cannot be increased, and the system enters malignant circulation.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides an outdoor unit of a three-pipe multi-split air conditioner system, which has the advantages of simple structure and stable operation.
The invention also provides a three-pipe multi-split system, which comprises the outdoor unit of the three-pipe multi-split system.
The invention also provides a control method of the three-pipe multi-split air conditioner system, and the control method has the advantages of convenience in operation and stability in operation.
According to the outdoor unit of the three-pipe multi-split air conditioner system, which is provided with a high-pressure liquid pipe, a low-pressure air pipe and a high-pressure air pipe, the outdoor unit comprises: the compressor is provided with an exhaust port and a return air port, and the return air port is connected with the low-pressure air pipe; the first reversing assembly comprises a first valve port to a third valve port, the first valve port is communicated with the second valve port and the third valve port in a switching way, the first valve port is connected with the exhaust port, and the second valve port is connected with the low-pressure air pipe; the second reversing component comprises a first port to a third port, the first port is communicated with the second port and the third port in a switching way, the first port is connected with the exhaust port, the second port is connected with the low-pressure air pipe, and the third port is connected with the high-pressure air pipe; the first end of the outdoor heat exchanger is connected with the third valve port, and the second end of the outdoor heat exchanger is connected with the high-pressure liquid pipe; a heating device for heating the refrigerant flowing from the low-pressure air pipe to the air return port; and the control device is connected with the heating device to control the heating device to be turned on or turned off.
According to the outdoor unit of the three-pipe multi-split air conditioner system, the heating device and the control device are arranged, and the control device can control the heating device to heat the low-pressure air pipe, so that the liquid refrigerant in the low-pressure air pipe is heated and gasified into the gaseous refrigerant, the phenomenon that the liquid refrigerant enters the compressor to generate liquid impact is effectively prevented from damaging the compressor, the working performance of the compressor is improved, and the heat exchange performance of the outdoor unit is further improved.
According to some embodiments of the invention, the gas-liquid separator further comprises an inlet connected to the low pressure gas pipe through a first refrigerant line and a gas outlet connected to the return gas port through a second refrigerant line.
In some embodiments of the invention, the heating device comprises a first heating element provided on the gas-liquid separator.
According to some embodiments of the invention, the first heating element is provided on an outer wall of the housing of the gas-liquid separator.
In some embodiments of the invention, the heating device includes a second heating element that heats the refrigerant in the first refrigerant line.
According to some embodiments of the invention, the heating device comprises a third heating element for heating the refrigerant in the second refrigerant line.
In some embodiments of the present invention, the plurality of the outdoor heat exchangers is provided, the plurality of the first reversing assemblies is provided, the plurality of the outdoor heat exchangers are provided in one-to-one correspondence with the plurality of the first reversing assemblies, each of the first valve ports is connected with the exhaust port, each of the second valve ports is connected with the low-pressure air pipe, and each of the third valve ports is connected with the corresponding outdoor heat exchanger.
According to the embodiment of the invention, the three-pipe multi-split system comprises: the outdoor unit is the outdoor unit; the indoor units comprise indoor heat exchangers, the first ends of the indoor heat exchangers are connected with the low-pressure air pipes through first control valves, the first ends of the indoor heat exchangers are connected with the high-pressure air pipes through second control valves, and the second ends of the indoor heat exchangers are connected with the high-pressure liquid pipes through throttling elements.
According to the three-pipe multi-split air-conditioning system provided by the embodiment of the invention, the heating device and the control device are arranged, and the control device can control the heating device to heat the low-pressure air pipe, so that the liquid refrigerant in the low-pressure air pipe is heated and gasified into the gaseous refrigerant, the phenomenon that the liquid refrigerant enters the compressor to generate 'liquid impact' is effectively prevented from damaging the compressor, the working performance of the compressor is improved, and the working performance of the three-pipe multi-split air-conditioning system is further improved.
According to the control method of the three-pipe multi-connected machine system, which is provided by the embodiment of the invention, the control method comprises the following steps: detecting outdoor environment temperature in a refrigeration mode; when the outdoor environment temperature is lower than a set temperature, controlling the heating device to be started to heat the refrigerant; and when the outdoor environment temperature is higher than the set temperature, controlling the heating device to be turned off.
According to the control method of the three-pipe multi-split air conditioner system, when the content of liquid refrigerant in the refrigerant returned to the compressor is high, the heating device can be started by the control device to heat the refrigerant, so that the liquid refrigerant is gasified into gaseous refrigerant, and the compressor is prevented from being impacted by liquid; when the content of the liquid refrigerant in the refrigerant returned to the compressor is smaller, the heating device can be closed through the control device, so that the heat waste of the heating device can be reduced, and the energy and the consumption are saved.
According to some embodiments of the invention, the method further comprises the steps of: when the heating device is started, detecting the low pressure of the low pressure side of the outdoor heat exchanger, and calculating the superheat degree of the return air; (the superheat degree of the return air is obtained by detecting the return air pressure and the return air temperature in a conventional way), and when the low pressure is less than a first preset value A or the superheat degree of the return air is less than a first set value C, the heating device is kept in an on state; when the first preset value A is less than or equal to the low pressure and less than or equal to the second preset value B or the first preset value C is less than or equal to the low pressure and less than or equal to the second preset value D, reducing the power supply voltage of the heating device when the power supply voltage of the heating device is adjustable, and controlling the heating device to be intermittently started when the power supply voltage of the heating device is not adjustable; and when the low pressure is more than the second preset value B or the low pressure is more than the second set value D, controlling the heating device to be closed.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a three-pipe multi-split system according to an embodiment of the present invention, wherein the three-pipe multi-split system is in a refrigeration mode, and a direction indicated by an arrow is a refrigerant flowing direction;
Fig. 2 is a schematic structural diagram of a three-pipe multi-split system according to an embodiment of the present invention, where the three-pipe multi-split system is in a heating mode, and a direction indicated by an arrow is a refrigerant flowing direction.
Reference numerals:
high pressure fluid line 110, low pressure gas line 120, high pressure gas line 130,
Compressor 20, discharge port 210, return port 220,
The first reversing assembly 30, the first port 310, the second port 320, the third port 330,
The second reversing component 40, the first port 410, the second port 420, the third port 430,
The outdoor heat exchanger 50 is provided with a heat-exchanging pipe,
The heating device 60, the first heating element 610, the second heating element 620, the third heating element 630,
The gas-liquid separator 70, the inlet 710, the gas outlet 720, the first refrigerant line 730, the second refrigerant line 740,
The indoor unit 800, the indoor heat exchanger 810, the first control valve 811, the second control valve 812,
Three-pipe multi-split system 1000.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "bottom", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1 and 2, an outdoor unit of a three-pipe multi-split system 1000 according to an embodiment of the present invention is described.
As shown in fig. 1 and 2, the outdoor unit is provided with a high pressure liquid pipe 110, a low pressure gas pipe 120, and a high pressure gas pipe 130. It should be noted that, the "high-pressure liquid pipe 110, low-pressure gas pipe 120 and high-pressure gas pipe 130" described herein are defined according to the flowing direction of the refrigerant in the three-pipe multi-split system 1000, and are not defined according to the specific values of the pressure when the refrigerant in the pipe flows. The outdoor unit includes: the compressor 20, the first reversing assembly 30, the second reversing assembly 40, the outdoor heat exchanger 50, the heating device 60, and a control device (not shown in the drawing).
Specifically, as shown in fig. 1 and 2, the compressor 20 is provided with a discharge port 210 and a return port 22, and the return port 220 is connected to the low-pressure gas pipe 120. Thus, the refrigerant can be returned from the return port 220 to the compressor 20 for compression, and the high-temperature and high-pressure gaseous refrigerant compressed by the compressor 20 can be discharged from the discharge port 210 to the compressor 20.
The first reversing assembly 30 includes first to third ports 310 to 330, the first port 310 being in switching communication with the second and third ports 320 and 330, the first port 310 being connected to the exhaust port 210, and the second port 320 being connected to the low pressure gas pipe 120. Therefore, the first reversing assembly 30 controls the switching of the first valve port 310 to the third valve port 330, so that the flow direction of the refrigerant can be adjusted and switched, and different flow direction requirements of the three-pipe multi-split air conditioner system 1000 on the refrigerant in the refrigerating mode and the heating mode can be realized.
The second reversing assembly 40 includes a first port 410 to a third port 430, the first port 410 being in switching communication with the second port 420 and the third port 430, the first port 410 being connected to the exhaust port 210, the second port 420 being connected to the low pressure gas pipe 120, and the third port 430 being connected to the high pressure gas pipe 130. Therefore, the second reversing component 40 controls the switching of the first port 410 to the third port 430, so that the flow direction of the refrigerant can be adjusted and switched, and different flow direction requirements of the three-pipe multi-split air conditioning system 1000 on the refrigerant in the refrigerating mode and the heating mode can be realized.
The first end of the outdoor heat exchanger 50 is connected to the third valve port 330, and the second end of the outdoor heat exchanger 50 is connected to the high-pressure liquid pipe 110. The heating device 60 heats the refrigerant flowing from the low-pressure gas pipe 120 to the return port 220, and thereby the heating device 60 heats the refrigerant in the low-pressure gas pipe 120, so that the liquid refrigerant in the low-pressure gas pipe 120 can be gasified into a gaseous refrigerant, and the phenomenon of "liquid impact" of the compressor 20 caused by the liquid refrigerant entering the compressor 20 is prevented, thereby affecting the working performance of the compressor 20.
The control device is connected with the heating device 60 to control the heating device 60 to be turned on or off. Therefore, the control device can control the heating device 60 to be turned on or off, when the liquid refrigerant exists in the low-pressure air pipe 120, the control device can turn on the heating device 60 to heat the low-pressure air pipe 120, so that the liquid refrigerant in the low-pressure air pipe 120 is gasified, and the liquid refrigerant is prevented from entering the compressor 20 to influence the working performance of the compressor 20; when the liquid refrigerant does not exist in the low-pressure air pipe 120 or the content of the liquid refrigerant is small, the heating device 60 can be turned off by the control device, so that the consumption can be reduced.
According to the outdoor unit of the three-pipe multi-split air conditioner system 1000 provided by the embodiment of the invention, the heating device 60 and the control device are arranged, and the control device can control the heating device 60 to heat the low-pressure air pipe 120, so that the liquid refrigerant in the low-pressure air pipe 120 is heated to be a gaseous refrigerant, the wet compression of the compressor 20 caused by the entry of the liquid refrigerant into the compressor 20 is effectively prevented, the working performance of the compressor 20 is improved, and the heat exchange performance of the outdoor unit is further improved.
According to some embodiments of the present invention, as shown in fig. 1 and 2, the outdoor unit may further include a gas-liquid separator 70, the gas-liquid separator 70 including an inlet 710 and a gas outlet 720, the inlet 710 being connected to the low pressure gas pipe 120 through a first refrigerant pipe 730, and the gas outlet 720 being connected to the return air port 220 through a second refrigerant pipe 740. Thus, the refrigerant in the low-pressure gas pipe 120 may enter the gas-liquid separator 70 from the inlet 710 via the first refrigerant pipe 730 for gas-liquid separation, and the gas refrigerant obtained after the gas-liquid separation is discharged from the gas outlet 720 and enters the compressor 20 from the air return port 220 via the second refrigerant pipe 740. Therefore, by arranging the gas-liquid separator 70, the content of the liquid refrigerant returned to the compressor 20 is effectively reduced, and the running stability of the compressor 20 is improved.
In some embodiments of the invention, the heating device 60 may include a first heating element 610 disposed on the gas-liquid separator 70. Therefore, the first heating element 610 can be utilized to heat the refrigerant in the gas-liquid separator 70 and at the inlet 710 and the gas outlet 720 of the gas-liquid separator 70, so that the content of the liquid refrigerant returned to the compressor 20 is effectively reduced, and the working performance of the compressor 20 is improved.
According to some embodiments of the invention, the first heating element 610 is provided on an outer wall of the housing of the gas-liquid separator 70. Thereby facilitating a secure assembly of the first heating element 610. Further, by providing the first heating element 610 on the outer peripheral wall of the housing of the gas-liquid separator 70, the refrigerant in the gas-liquid separator 70 can be directly heated by the first heating element 610, and heat loss waste is reduced.
In some embodiments of the present invention, the heating device 60 may include a second heating element 620 that heats the refrigerant in the first refrigerant line 730. Thus, the second heating element 620 heats the refrigerant in the first refrigerant pipe 730, so that the liquid refrigerant in the first refrigerant pipe 730 is gasified into the gaseous refrigerant, the content of the liquid refrigerant in the first refrigerant pipe 730 is reduced, and the working performance of the compressor 20 is improved.
According to some embodiments of the present invention, the heating device 60 includes a third heating element 630 that heats the refrigerant in the second refrigerant line 740. Therefore, the third heating element 630 heats the refrigerant in the second refrigerant pipe 740, so that the liquid refrigerant in the second refrigerant pipe 740 is gasified into the gaseous refrigerant, the content of the liquid refrigerant in the second refrigerant pipe 740 is reduced, and the working performance of the compressor 20 is improved.
In some embodiments of the present invention, as shown in fig. 1 and 2, the outdoor heat exchanger 50 may be plural, the first reversing element 30 may be plural, the plural outdoor heat exchangers 50 are disposed in one-to-one correspondence with the plural first reversing elements 30, each first valve port 310 is connected to the exhaust port 210, each second valve port 320 is connected to the low pressure gas pipe 120, and each third valve port 330 is connected to the corresponding outdoor heat exchanger 50. It can be appreciated that by providing a plurality of outdoor heat exchangers 50, the effective heat exchanging area of the outdoor heat exchangers 50 is increased, thereby improving the heat exchanging performance of the outdoor heat exchangers 50. By arranging the plurality of first reversing assemblies 30 corresponding to the plurality of outdoor heat exchangers 50 one by one, the flow direction of the refrigerant can be controlled and regulated by utilizing the corresponding first reversing assemblies 30, so that different flow direction requirements of the refrigerant under the refrigerating and heating modes of the three-pipe multi-split air conditioning system 1000 can be realized.
According to the three-pipe multi-split system 1000 of the embodiment of the invention, the three-pipe multi-split system 1000 includes: an outdoor unit and a plurality of indoor units 800.
The outdoor unit is the above-mentioned outdoor unit, each indoor unit 800 includes an indoor heat exchanger 810, and a first end of each indoor heat exchanger 810 is connected to the low pressure gas pipe 120 through a first control valve 811. Thereby, the on-off between the indoor heat exchanger 810 and the low pressure gas pipe 120 can be controlled by the first control valve 811. The first end of each indoor heat exchanger 810 is connected to the high pressure gas pipe 130 through a second control valve 812, whereby the on-off between the indoor heat exchanger 810 and the high pressure gas pipe 130 can be controlled through the second control valve 812. A second end of each indoor heat exchanger 810 is connected to the high pressure liquid pipe 110 through a throttling element. By providing the throttle element, the refrigerant flowing through the throttle element can be throttled and depressurized, and the flow parameters of the refrigerant can be adjusted.
According to the three-pipe multi-split air-conditioning system 1000 of the embodiment of the invention, the heating device 60 and the control device are arranged, and the control device can control the heating device 60 to heat the low-pressure air pipe 120, so that the liquid refrigerant in the low-pressure air pipe 120 is heated to be gaseous refrigerant, the phenomenon that the compressor 20 is damaged due to the fact that the liquid refrigerant enters the compressor 20 to generate liquid impact is effectively prevented, the working performance of the compressor 20 is improved, and the heat exchange performance of the outdoor unit is further improved.
According to the control method of the three-pipe multi-split system 1000 in the embodiment of the invention, the three-pipe multi-split system 1000 is the three-pipe multi-split system 1000, and the control method comprises the following steps:
Detecting outdoor environment temperature in a refrigeration mode;
when the outdoor environment temperature is lower than the set temperature, the heating device is controlled to be started to heat the refrigerant. Therefore, the heating device is used for heating the refrigerant, so that the liquid refrigerant is gasified into the gaseous refrigerant, and the problem that the performance of the compressor is affected when the liquid refrigerant enters the compressor is effectively avoided.
When the outdoor environment temperature is higher than the set temperature, the heating device is controlled to be turned off. Therefore, the heat waste of the heating device can be reduced, and the energy conservation and the consumption reduction can be realized.
According to the control method of the three-pipe multi-split air conditioning system 1000 in the embodiment of the invention, when the content of liquid refrigerant in the refrigerant returned to the compressor 20 is high, the heating device 60 can be started by the control device to heat the refrigerant, so that the liquid refrigerant is gasified into a gaseous refrigerant, and the compressor 20 is prevented from being subjected to liquid impact; when the content of the liquid refrigerant in the refrigerant returned to the compressor 20 is small, the heating device 60 can be turned off by the control device, so that the heat waste of the heating device 60 can be reduced, and the energy and the consumption can be reduced.
According to some embodiments of the invention, the method may further comprise the steps of: when the heating device is started, the low-pressure of the low-pressure side of the outdoor heat exchanger is detected, and the superheat degree of the return air is calculated. It should be noted that, the "superheat degree of return air" is calculated by detecting the return air pressure and the return air temperature, and the calculation mode is a conventional means, which is not described herein.
When the low pressure is less than a first preset value A or the superheat degree of the return air is less than a first set value C, the heating device is kept in an on state. Therefore, the liquid refrigerant can be heated, so that the liquid refrigerant is gasified into a gaseous refrigerant, and the liquid refrigerant is prevented from entering the compressor to cause a liquid impact phenomenon.
When the first preset value A is less than or equal to the low pressure and less than or equal to the second preset value B or the first preset value C is less than or equal to the low pressure and less than or equal to the second preset value D, the power supply voltage of the heating device is reduced when the power supply voltage of the heating device is adjustable, and the heating device is controlled to be intermittently started when the power supply voltage of the heating device is not adjustable. Therefore, the heat waste of the heating device can be reduced, and the energy conservation and the consumption reduction can be realized.
When the low pressure is more than a second preset value B or the low pressure is more than a second set value D, the heating device is controlled to be closed, and the experiment proves that when the requirement is met: when the low pressure is more than the second preset value B or the low pressure is more than the second preset value D, the content of the liquid refrigerant in the refrigerant returned to the compressor is little. Therefore, the heating device is turned off, so that the heat waste of the heating device can be reduced, and the energy conservation and the consumption reduction are realized.
The cooling operation mode and the heating operation mode of the triple-pipe multi-split system 1000 according to the embodiment of the present invention will be described in detail with reference to fig. 1 and 2.
As shown in fig. 1, when the three-pipe multi-split system 1000 is in the refrigeration mode, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 20 flows to the first reversing assembly 30, the first valve port 310 is communicated with the third valve port 330, the high-temperature and high-pressure gaseous refrigerant sequentially passes through the first valve port 310 and the third valve port 330 to enter the outdoor heat exchanger 50, after the high-temperature and high-pressure gaseous refrigerant exchanges heat in the outdoor heat exchanger 50, the high-pressure liquid refrigerant is changed into a high-pressure liquid refrigerant, and the high-pressure liquid refrigerant flows into the high-pressure liquid pipe 110 and enters the indoor heat exchanger 810, and evaporates and absorbs heat in the indoor heat exchanger 810, thereby realizing the indoor refrigeration function. The refrigerant after heat exchange by the indoor heat exchanger 810 enters the low-pressure air pipe 120, the refrigerant in the low-pressure air pipe 120 enters the gas-liquid separator 70 from the inlet 710, the refrigerant is subjected to gas-liquid separation in the gas-liquid separator 70, and the gaseous refrigerant flows out of the gas-liquid separator 70 from the gas outlet 720 and returns to the compressor 20 from the air return port 220, so that the refrigeration cycle of the refrigerant is completed. When the refrigerant flows through the first refrigerant pipe 730, the gas-liquid separator 70 and the second refrigerant pipe 740, the second heating element 620, the first heating element 610 and the third heating element 630 heat the first refrigerant pipe 730, the first heating element 610 and the third heating element 630 respectively, so that the liquid refrigerant is gasified into the gaseous refrigerant, the content of the liquid refrigerant is further reduced, the compressor 20 is prevented from generating a liquid impact phenomenon, and the working performance of the compressor 20 is improved.
As shown in fig. 2, when the three-pipe multi-split air-conditioning system 1000 is in the heating mode, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 20 flows to the second reversing assembly 40, the first port 410 is communicated with the third port 430, the high-temperature and high-pressure gaseous refrigerant sequentially passes through the first port 410 and the third port 430 to enter the indoor heat exchanger 810, and the high-temperature and high-pressure gaseous refrigerant releases heat in the indoor heat exchanger 810, so that the indoor heating function is realized. The refrigerant after heat exchange is changed into a high-pressure liquid refrigerant, and the high-pressure liquid refrigerant flows into the high-pressure liquid pipe 110 and enters the outdoor heat exchanger 50, and heat exchange is performed in the outdoor heat exchanger 50. The refrigerant after heat exchange by the outdoor heat exchanger 50 enters the low-pressure air pipe 120, the refrigerant in the low-pressure air pipe 120 enters the gas-liquid separator 70 from the inlet 710, the refrigerant is subjected to gas-liquid separation in the gas-liquid separator 70, and the gaseous refrigerant flows out of the gas-liquid separator 70 from the gas outlet 720 and returns to the compressor 20 from the air return port 220, so that the heating cycle of the refrigerant is completed.
Therefore, by arranging the heating device 60 and the control device, the control device can control the heating device 60 to heat the low-pressure air pipe 120, so that the liquid refrigerant in the low-pressure air pipe 120 is heated to be gaseous refrigerant, the phenomenon that the liquid refrigerant enters the compressor 20 to generate liquid impact is effectively prevented from damaging the compressor 20, the working performance of the compressor 20 is improved, and the heat exchange performance of the outdoor unit is further improved.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (4)
1. A control method of a three-pipe multi-split system, the three-pipe multi-split system comprises:
The indoor units comprise indoor heat exchangers, the first ends of the indoor heat exchangers are connected with a low-pressure air pipe through first control valves, the first ends of the indoor heat exchangers are connected with a high-pressure air pipe through second control valves, and the second ends of the indoor heat exchangers are connected with a high-pressure liquid pipe through throttling elements;
the off-premises station, the off-premises station is equipped with high-pressure liquid pipe, low-pressure air pipe and high-pressure air pipe, the off-premises station includes:
the compressor is provided with an exhaust port and a return air port, and the return air port is connected with the low-pressure air pipe;
The first reversing assembly comprises a first valve port to a third valve port, the first valve port is communicated with the second valve port and the third valve port in a switching way, the first valve port is connected with the exhaust port, and the second valve port is connected with the low-pressure air pipe;
The second reversing component comprises a first port to a third port, the first port is communicated with the second port and the third port in a switching way, the first port is connected with the exhaust port, the second port is connected with the low-pressure air pipe, and the third port is connected with the high-pressure air pipe;
The first end of the outdoor heat exchanger is connected with the third valve port, and the second end of the outdoor heat exchanger is connected with the high-pressure liquid pipe;
a heating device for heating the refrigerant flowing from the low-pressure air pipe to the air return port;
The control device is connected with the heating device to control the heating device to be turned on or turned off;
The gas-liquid separator comprises an inlet and a gas outlet, the inlet is connected with the low-pressure gas pipe through a first refrigerant pipeline, and the gas outlet is connected with the air return port through a second refrigerant pipeline;
The heating device comprises a first heating element arranged on the gas-liquid separator;
the first heating element is arranged on the outer wall of the shell of the gas-liquid separator
The control method comprises the following steps:
Detecting outdoor environment temperature in a refrigeration mode;
When the outdoor environment temperature is lower than a set temperature, controlling the heating device to be started to heat the refrigerant; when the outdoor environment temperature is higher than a set temperature, the heating device is controlled to be closed;
The method also comprises the following steps:
Detecting a low pressure of the low pressure side of the outdoor heat exchanger when the heating device is turned on;
when the low pressure is less than a first preset value A, the heating device is kept in an on state;
when the first preset value A is less than or equal to the low pressure and less than or equal to the second preset value B, reducing the power supply voltage of the heating device when the power supply voltage of the heating device is adjustable, and controlling the heating device to be intermittently started when the power supply voltage of the heating device is not adjustable;
and when the low pressure is larger than a second preset value B, controlling the heating device to be closed.
2. The method according to claim 1, wherein the heating device includes a second heating element for heating the refrigerant in the first refrigerant line.
3. The method according to claim 1, wherein the heating device includes a third heating element for heating the refrigerant in the second refrigerant line.
4. A control method of a three-pipe multi-split air conditioner system according to any one of claims 1 to 3, wherein the number of the outdoor heat exchangers is plural, the number of the first reversing assemblies is plural, the plurality of the outdoor heat exchangers are arranged in one-to-one correspondence with the plurality of the first reversing assemblies, each first valve port is connected with the air outlet, each second valve port is connected with the low-pressure air pipe, and each third valve port is connected with the corresponding outdoor heat exchanger.
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| CN109405383B (en) * | 2018-10-29 | 2020-08-18 | 宁波奥克斯电气股份有限公司 | Air conditioner liquid return prevention control method and air conditioner |
| CN109780745B (en) * | 2018-12-03 | 2024-05-03 | 珠海格力电器股份有限公司 | Air conditioner |
| CN111102681B (en) * | 2019-12-16 | 2021-02-23 | 珠海格力电器股份有限公司 | Compressor heating device control method, computer readable storage medium and air conditioner |
| CN111473496B (en) * | 2020-04-29 | 2021-08-13 | 广东美的暖通设备有限公司 | Air conditioning system, control method and device thereof and storage medium |
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